基于非接触测量技术的降落伞流场测试方法研究

摘要

In the opening single reflux wind tunnel tests, using an imaging system consists of laser light sheet components, light arms, laser pulse synchronizer, CCD cameras and other components to obtain image data, and then by the frame grabber and image analysis software analysis and display system, gain flow field characteristics for the several typical structure of models. The test results showed that the non-contact technology used parachutes particle image velocimetry fl ow field test trials are feasible, data are true and accurate. In addition, non-contact particle image velocimetry technique in comparison with contact flow field measurement techniques haves many advantages which include quantitative measurement in all fluid, the less instrument interference for fluid, high precision and accuracy, etc.%在开口单回流式风洞试验中，采用由激光器、片光元件、光臂、激光脉冲同步器、CCD摄像机等组成的成像系统获取图像数据，再由帧抓取器和图像分析软件组成的分析与显示系统，获取了几种典型结构的模型伞尾流绕流场特性。试验结果表明，非接触式的粒子图像测速技术应用于降落伞流场测试试验是可行的，测取的数据真实准确；相比它接触性流场测量技术，具有可以全场瞬态的定量测量、仪器对流体干扰少、较高的精度与准确率等优点。